<template>
	<view class="container">
		<!-- 空白页 -->
		<view v-if="!hasLogin || empty===true" class="empty">
			<image src="/static/emptyCart.jpg" mode="aspectFit"></image>
			<view v-if="hasLogin" class="empty-tips">
				空空如也
				<navigator class="navigator" v-if="hasLogin" url="../index/index" open-type="switchTab">随便逛逛></navigator>
			</view>
			<view v-else class="empty-tips">
				空空如也
				<view class="navigator" @click="navToLogin">去登陆></view>
			</view>
		</view>
		<view v-else>
			<!-- 列表 -->
			<view class="cart-list">
				<block v-for="(item, index) in cartList" :key="item.id">
					<view class="cart-item" :class="{'b-b': index!==cartList.length-1}">	
						<!-- 图标 -->
						<view class="yticon icon-xuanzhong2 checkbox" :class="{checked: item.checked}" @click="check('item', index)"></view>
						<!-- 图片 -->
						<view class="image-wrapper">
							<image :src="item.img" class="loaded" mode="aspectFill" lazy-load @load="onImageLoad('cartList', index)" @error="onImageError('cartList', index)"></image>
							<!-- <image :src="item.image" :class="[item.loaded]" mode="aspectFill" lazy-load @load="onImageLoad('cartList', index)" @error="onImageError('cartList', index)"></image> -->
						</view>
						<!-- 内容 -->
						<view class="item-right">
							<text class="clamp title">{{item.name}}</text>
							<text class="attr">{{item.attr_name}}</text>
							<view class="flex">
								<text class="price">¥{{item.retail_price}}</text>
								<uni-number-box class="step" :min="1" :max="item.stock" :value="(parseInt(item.number) > item.stock) ? item.stock : parseInt(item.number)" :isMax="(parseInt(item.number) >= item.stock) ? true : false" :isMin="parseInt(item.number) == 1" :index="index" @eventChange="numberChange"></uni-number-box>
							</view>
						</view>
						<!-- <text class="del-btn yticon icon-fork" @click="deleteCartItem(index)"></text> -->
					</view>
				</block>
			</view>
			
			<view class="cart-list">
				<block v-for="(item, index) in cartDisableList" :key="item.id">
					<view class="cart-item" :class="{'b-b': index!==cartList.length-1}">	
						<!-- 图标 -->
						<view class="yticon icon-xuanzhong2 checkbox" disabled="disabled"></view>
						<!-- 图片 -->
						<view class="image-wrapper">
							<image :src="item.img" class="loaded" mode="aspectFill" lazy-load @load="onImageLoad('cartList', index)" @error="onImageError('cartList', index)"></image>
							<!-- <image :src="item.image" :class="[item.loaded]" mode="aspectFill" lazy-load @load="onImageLoad('cartList', index)" @error="onImageError('cartList', index)"></image> -->
						</view>
						<!-- 内容 -->
						<view class="item-right">
							<text class="clamp title">{{item.name}}</text>
							<text class="attr">{{item.attr_name}}</text>
							<view class="flex">
								<text class="price">¥{{item.retail_price}}</text>
								<uni-number-box class="step" :min="1" :max="item.stock" :value="(parseInt(item.number) > item.stock) ? item.stock : parseInt(item.number)" :isMax="(parseInt(item.number) >= item.stock) ? true : false" :isMin="parseInt(item.number) == 1" :index="index" @eventChange="numberChange"></uni-number-box>
							</view>
						</view>
						<!-- <text class="del-btn yticon icon-fork" @click="deleteCartItem(index)"></text> -->
					</view>
				</block>
			</view>
			<!-- 底部菜单栏 -->
			<view class="action-section">
				<view class="checkbox">
					<image :src="allChecked?'/static/selected.png':'/static/select.png'" mode="aspectFit" @click="check('all')"></image>
					<view class="clear-btn" :class="{show: allChecked}" @click="clearCart">清空</view>
				</view>
				<view class="total-box">
					<text class="price">¥{{total}}</text>
					<text class="coupon">已优惠<text>0</text>元</text>
				</view>
				<button type="primary" class="no-border confirm-btn" @click="createOrder">去结算</button>
			</view>
		</view>
	</view>
</template>

<script>
	import {mapState, mapMutations} from 'vuex';
	import uniNumberBox from '@/components/uni-number-box.vue';
	import md5 from '@/common/md5.js'
	export default {
		components: {
			uniNumberBox
		},
		data() {
			return {
				total: 0, //总价格
				allChecked: false, //全选状态  true|false
				empty: false, //空白页现实  true|false
				cartList: [],
				cartDisableList: [],
			};
		},
		onLoad(){
			//this.loadData();
		},
		onShow(){
			 this.$api.setCartNumber();
			 this.loadData();
		},
		watch:{
			//显示空白页
			cartList(e){
				let empty = e.length === 0 ? true: false;
				if(this.empty !== empty){
					this.empty = empty;
				}
			}
		},
		computed:{
			...mapState(['hasLogin','userInfo'])
		},
		methods: {
			...mapMutations(["login"]),
			//请求数据
			async loadData(){
				let that = this;
				let _param = {
					token:that.userInfo.token,
				};
				that.$api.getUrl(that.$api._api.ApiCartIndex, _param ,function(res){
					let cartList = res['list'].map(item=>{
						item.checked = true;
						return item;
					}) ;
					that.cartList = cartList;
					that.cartDisableList = res['disabled'] || [];
					that.calcTotal();  //计算总价
				})
			},
			//监听image加载完成
			onImageLoad(key, index) {
				this.$set(this[key][index], 'loaded', 'loaded');
			},
			//监听image加载失败
			onImageError(key, index) {
				this[key][index].image = '/static/errorImage.jpg';
			},
			navToLogin(){
				uni.navigateTo({
					url: '/pages/public/login'
				})
			},
			 //选中状态处理
			check(type, index){
				if(type === 'item'){
					this.cartList[index].checked = !this.cartList[index].checked;
				}else{
					const checked = !this.allChecked
					const list = this.cartList;
					list.forEach(item=>{
						item.checked = checked;
					})
					this.allChecked = checked;
				}
				this.calcTotal(type);
			},
			changeCartNumber(){
				let _info = this.userInfo;
				let _num = 0;
				
				for (let item in this.cartList) {
					_num += parseInt(this.cartList[item].number)
				}
			
				this.$set(_info, "cart_number", _num);
				this.login(_info);
				
				this.$api.setCartNumber();
			},
			//数量
			numberChange(data){
				this.cartList[data.index].number = parseInt(data.number);
				let that = this;
				let _param = {id:this.cartList[data.index].id,token:this.userInfo.token,number:parseInt(data.number)};
				this.$api.postUrl(this.$api._api.ApiCartEditer , _param ,function(res){
					that.calcTotal();
					that.changeCartNumber();
				})
			},
			//删除
			deleteCartItem(index){
				let list = this.cartList;
				let row = list[index];
				let id = [row.id];
				let _param = {id:id,token:this.userInfo.token};
				let that = this;
				this.$api.postUrl(this.$api._api.ApiCartDel , _param ,function(res){
					that.cartList.splice(index, 1);
					that.calcTotal();
					uni.hideLoading();
					that.changeCartNumber();
				})
			},
			//清空
			clearCart(){
				uni.showModal({
					content: '清空购物车？',
					success: (e)=>{
						if(e.confirm){
							let _param = {token:this.userInfo.token};
							let that = this;
							this.$api.postUrl(this.$api._api.ApiCartClear , _param ,function(res){
								that.cartList = [];
								that.changeCartNumber();
							})
						}
					}
				})
			},
			//计算总价
			calcTotal(){
				let list = this.cartList;
				if(list.length === 0){
					this.empty = true;
					return;
				}
				let total = 0;
				let checked = true;
				list.forEach(item=>{
					if(item.checked === true){
						total += item.retail_price * item.number;
					}else if(checked === true){
						checked = false;
					}
				})
				this.allChecked = checked;
				this.total = Number(total.toFixed(2));
			},
			//创建订单
			createOrder(){
				let list = this.cartList;
				let goodsData = [];
				list.forEach(item=>{
					if(item.checked){
						goodsData.push(item.id)
					}
				})
				 let _k = md5(this.$api.random_char(15));
				uni.setStorage({//缓存用户登陆状态
				    key: _k,  
				    data: goodsData  
				})
				uni.navigateTo({
					url: '/pages/user/order/createOrder?data='+_k
				})
			}
		}
	}
</script>

<style lang='scss'>
	page{background:#fff;}
	.container{
		padding-bottom: 134rpx;
		/* 空白页 */
		.empty{
			position:fixed;
			left: 0;
			top:0;
			width: 100%;
			height: 100vh;
			padding-bottom:100rpx;
			display:flex;
			justify-content: center;
			flex-direction: column;
			align-items:center;
			background: #fff;
			image{
				width: 240rpx;
				height: 160rpx;
				margin-bottom:30rpx;
			}
			.empty-tips{
				display:flex;
				font-size: $font-sm+2rpx;
				color: $font-color-disabled;
				.navigator{
					color: $uni-color-primary;
					margin-left: 16rpx;
				}
			}
		}
	}
	/* 购物车列表项 */
	.cart-item{
		display:flex;
		position:relative;
		padding:30rpx;
		.image-wrapper{
			width:180rpx;
			height:180rpx;
			/* flex-shrink: 0; */
			position:relative;
			image{
				border-radius:8rpx;
				width: 100%;height: 100%;object-fit: cover;
			}
		}
		.checkbox{
			align-self: center;
			font-size: 44rpx;
			line-height: 1;
			padding: 4rpx;
			color: $font-color-disabled;
			background:#fff;
			border-radius: 50px;margin-right: 20rpx;
		}
		.item-right{
			display:flex;
			flex-direction: column;
			flex: 1;
			overflow: hidden;
			position:relative;
			padding-left: 30rpx;
			.flex{display: flex;align-items: center;}
			.title,.price{
				font-size:$font-base + 2rpx;
				color: $font-color-dark;
				height: 40rpx;
				line-height: 40rpx;
			}
			.attr{
				font-size: $font-sm + 2rpx;
				color: $font-color-light;
				height: 50rpx;
				line-height: 50rpx;
			}
			.price{
				height: 50rpx;font-size: 32rpx;
				line-height:50rpx;flex: 1;color:#FA436A;font-weight: bold;
			}
			.step{position: initial;}
		}
		.del-btn{
			padding:4rpx 10rpx;
			font-size:34rpx; 
			height: 50rpx;
			color: $font-color-light;
		}
	}
	/* 底部栏 */
	.action-section{
		/* #ifdef H5 */
		margin-bottom:100rpx;
		/* #endif */
		position:fixed;
		left: 30rpx;
		bottom:30rpx;
		z-index: 95;
		display: flex;
		align-items: center;
		width: 690rpx;
		height: 100rpx;
		padding: 0 30rpx;
		background: rgba(255,255,255,.9);
		box-shadow: 0 0 20rpx 0 rgba(0,0,0,.5);
		border-radius: 16rpx;
		.checkbox{
			height:52rpx;
			position:relative;
			image{
				width: 52rpx;
				height: 100%;
				position:relative;
				z-index: 5;
			}
		}
		.clear-btn{
			position:absolute;
			left: 26rpx;
			top: 0;
			z-index: 4;
			width: 0;
			height: 52rpx;
			line-height: 52rpx;
			padding-left: 38rpx;
			font-size: $font-base;
			color: #fff;
			background: $font-color-disabled;
			border-radius:0 50px 50px 0;
			opacity: 0;
			transition: .2s;
			&.show{
				opacity: 1;
				width: 120rpx;
			}
		}
		.total-box{
			flex: 1;
			display:flex;
			flex-direction: column;
			text-align:right;
			padding-right: 40rpx;
			.price{
				font-size: $font-lg;
				color: $font-color-dark;
			}
			.coupon{
				font-size: $font-sm;
				color: $font-color-light;
				text{
					color: $font-color-dark;
				}
			}
		}
		.confirm-btn{
			padding: 0 38rpx;
			margin: 0;
			border-radius: 100px;
			height: 76rpx;
			line-height: 76rpx;
			font-size: $font-base + 2rpx;
			background: $uni-color-primary;
			box-shadow: 1px 2px 5px rgba(217, 60, 93, 0.72)
		}
	}
	/* 复选框选中状态 */
	.action-section .checkbox.checked,
	.cart-item .checkbox.checked{
		color: $uni-color-primary;
	}
</style>
